The discharge of industrial waste gas into the atmosphere will affect the air quality and lead to environmental problems such as acid rain and photochemical smog. At the same time, some toxic and harmful substances will enter the soil and water through atmospheric sedimentation, causing pollution to soil and water quality, destroying the ecological balance, reducing biodiversity, and also leading to global warming, triggering a series of climate change problems.
Industrial waste gas can be mainly divided into two categories: organic waste gas and inorganic waste gas. The organic waste gas mainly includes various hydrocarbons, alcohols, aldehydes, acids, ketones and amines. Inorganic waste gas mainly includes sulfur oxides, nitrogen oxides, carbon oxides, halogens and their compounds.
In specific industries, such as the iron and steel industry, chemical industry, electric power and building materials industry, etc., will produce industrial waste gas with their own characteristics. According to product categories, it can also be divided into coke oven exhaust gas, sulfuric acid exhaust gas, thermal power plant exhaust gas and so on. Industrial waste gas treatment is to pretreat the waste gas generated by factories and workshops before external discharge to meet the national standards for external emission of waste gas. In order to protect the environment and human health, industrial waste gas must be treated before it can be discharged.
There are two main treatment methods of denitrification of industrial waste gas: dry method and wet method. The dry method mainly includes selective catalytic reduction flue gas denitration (SCR) and selective non-catalytic reduction denitration, while the wet method has different implementation methods.
Among them, SCR (Selective Catalytic Reduction) is the most mature flue gas denitrification technology at present, which was first developed and put into use by Japan in the late 1960s and 1970s. SCR uses a reducing agent (such as ammonia or urea) to selectively react with NOx in the presence of a metal catalyst to produce harmless nitrogen and water vapor. The advantages of this method are high denitrification efficiency, no waste water and waste treatment, and not easy to cause secondary pollution.
SCR denitrification technology can effectively reduce NOx emissions and play a positive role in improving air quality. It provides an efficient and environmentally friendly solution for industrial waste gas treatment, and plays an important role in promoting green development.
Post time: Nov-06-2023